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Tidal is a language for live coding pattern. It provides a way to express music with very flexible timing, providing a little language for describing patterns as discrete sequences (which can be polyphonic and polymetric), some generators of continuous patterns (e.g. sinewaves, sawtooths) and a wide range of pattern transformations. Tidal is highly 'composable' in that pattern transformations can be easily combined together, allowing you to quickly create complex patterns from simple ingredients.

Tidal does not make sound itself, but rather controls synths using Open Sound Control or MIDI. By default, for its sister the Dirt sampler.

To see and hear Tidal in action, check out some of the videos of demos and performances.

Tidal is embedded in the Haskell language. You don't really have to learn Haskell to use Tidal, but it might help to pick up an introduction. You could try Graham Hutton's "Programming in Haskell" or Miran Lipovača's Learn you a Haskell for Great Good . Or, you could try learning enough syntax to get by just by playing around with Tidal..